Calling all chevy gurus-need help!!

[polevault1977]

I have a 99 chevy 1/2 4wd new body style in the shop right now. I am having a popping noise in the front suspension. The mechanic and I can not find what it is. Checked upper and lower a arms, all ball joints, axles, torsion crossmember isolators. It's not the intermediate steering shaft. Been there. I feel the popping sometimes where the crossmember torsion bar ends. It feels and sounds like it is coming from the front right.

You'd be a hero, if you could solve this one!!!

Thanks in advance, Danny